Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.036302   0.003202   11.34  0.00769 **
b -2.777992   0.211631  -13.13  0.00575 **
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.4543 on 2 degrees of freedom

Number of iterations to convergence: 8 
Achieved convergence tolerance: 3.759e-06